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250 lines
6.8 KiB
250 lines
6.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _linux_POSIX_TIMERS_H |
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#define _linux_POSIX_TIMERS_H |
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#include <linux/spinlock.h> |
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#include <linux/list.h> |
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#include <linux/alarmtimer.h> |
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#include <linux/timerqueue.h> |
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#include <linux/task_work.h> |
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struct kernel_siginfo; |
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struct task_struct; |
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/* |
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* Bit fields within a clockid: |
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* |
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* The most significant 29 bits hold either a pid or a file descriptor. |
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* |
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* Bit 2 indicates whether a cpu clock refers to a thread or a process. |
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* |
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* Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. |
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* |
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* A clockid is invalid if bits 2, 1, and 0 are all set. |
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*/ |
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#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) |
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#define CPUCLOCK_PERTHREAD(clock) \ |
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(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) |
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#define CPUCLOCK_PERTHREAD_MASK 4 |
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#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK) |
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#define CPUCLOCK_CLOCK_MASK 3 |
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#define CPUCLOCK_PROF 0 |
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#define CPUCLOCK_VIRT 1 |
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#define CPUCLOCK_SCHED 2 |
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#define CPUCLOCK_MAX 3 |
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#define CLOCKFD CPUCLOCK_MAX |
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#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) |
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static inline clockid_t make_process_cpuclock(const unsigned int pid, |
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const clockid_t clock) |
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{ |
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return ((~pid) << 3) | clock; |
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} |
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static inline clockid_t make_thread_cpuclock(const unsigned int tid, |
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const clockid_t clock) |
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{ |
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return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK); |
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} |
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static inline clockid_t fd_to_clockid(const int fd) |
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{ |
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return make_process_cpuclock((unsigned int) fd, CLOCKFD); |
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} |
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static inline int clockid_to_fd(const clockid_t clk) |
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{ |
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return ~(clk >> 3); |
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} |
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#ifdef CONFIG_POSIX_TIMERS |
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/** |
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* cpu_timer - Posix CPU timer representation for k_itimer |
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* @node: timerqueue node to queue in the task/sig |
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* @head: timerqueue head on which this timer is queued |
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* @task: Pointer to target task |
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* @elist: List head for the expiry list |
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* @firing: Timer is currently firing |
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*/ |
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struct cpu_timer { |
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struct timerqueue_node node; |
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struct timerqueue_head *head; |
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struct pid *pid; |
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struct list_head elist; |
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int firing; |
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}; |
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static inline bool cpu_timer_enqueue(struct timerqueue_head *head, |
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struct cpu_timer *ctmr) |
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{ |
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ctmr->head = head; |
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return timerqueue_add(head, &ctmr->node); |
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} |
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static inline void cpu_timer_dequeue(struct cpu_timer *ctmr) |
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{ |
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if (ctmr->head) { |
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timerqueue_del(ctmr->head, &ctmr->node); |
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ctmr->head = NULL; |
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} |
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} |
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static inline u64 cpu_timer_getexpires(struct cpu_timer *ctmr) |
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{ |
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return ctmr->node.expires; |
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} |
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static inline void cpu_timer_setexpires(struct cpu_timer *ctmr, u64 exp) |
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{ |
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ctmr->node.expires = exp; |
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} |
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/** |
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* posix_cputimer_base - Container per posix CPU clock |
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* @nextevt: Earliest-expiration cache |
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* @tqhead: timerqueue head for cpu_timers |
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*/ |
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struct posix_cputimer_base { |
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u64 nextevt; |
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struct timerqueue_head tqhead; |
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}; |
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/** |
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* posix_cputimers - Container for posix CPU timer related data |
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* @bases: Base container for posix CPU clocks |
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* @timers_active: Timers are queued. |
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* @expiry_active: Timer expiry is active. Used for |
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* process wide timers to avoid multiple |
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* task trying to handle expiry concurrently |
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* |
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* Used in task_struct and signal_struct |
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*/ |
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struct posix_cputimers { |
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struct posix_cputimer_base bases[CPUCLOCK_MAX]; |
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unsigned int timers_active; |
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unsigned int expiry_active; |
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}; |
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/** |
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* posix_cputimers_work - Container for task work based posix CPU timer expiry |
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* @work: The task work to be scheduled |
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* @scheduled: @work has been scheduled already, no further processing |
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*/ |
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struct posix_cputimers_work { |
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struct callback_head work; |
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unsigned int scheduled; |
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}; |
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static inline void posix_cputimers_init(struct posix_cputimers *pct) |
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{ |
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memset(pct, 0, sizeof(*pct)); |
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pct->bases[0].nextevt = U64_MAX; |
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pct->bases[1].nextevt = U64_MAX; |
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pct->bases[2].nextevt = U64_MAX; |
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} |
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void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit); |
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static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct, |
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u64 runtime) |
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{ |
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pct->bases[CPUCLOCK_SCHED].nextevt = runtime; |
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} |
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/* Init task static initializer */ |
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#define INIT_CPU_TIMERBASE(b) { \ |
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.nextevt = U64_MAX, \ |
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} |
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#define INIT_CPU_TIMERBASES(b) { \ |
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INIT_CPU_TIMERBASE(b[0]), \ |
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INIT_CPU_TIMERBASE(b[1]), \ |
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INIT_CPU_TIMERBASE(b[2]), \ |
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} |
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#define INIT_CPU_TIMERS(s) \ |
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.posix_cputimers = { \ |
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.bases = INIT_CPU_TIMERBASES(s.posix_cputimers.bases), \ |
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}, |
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#else |
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struct posix_cputimers { }; |
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struct cpu_timer { }; |
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#define INIT_CPU_TIMERS(s) |
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static inline void posix_cputimers_init(struct posix_cputimers *pct) { } |
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static inline void posix_cputimers_group_init(struct posix_cputimers *pct, |
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u64 cpu_limit) { } |
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#endif |
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#ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK |
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void posix_cputimers_init_work(void); |
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#else |
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static inline void posix_cputimers_init_work(void) { } |
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#endif |
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#define REQUEUE_PENDING 1 |
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/** |
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* struct k_itimer - POSIX.1b interval timer structure. |
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* @list: List head for binding the timer to signals->posix_timers |
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* @t_hash: Entry in the posix timer hash table |
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* @it_lock: Lock protecting the timer |
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* @kclock: Pointer to the k_clock struct handling this timer |
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* @it_clock: The posix timer clock id |
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* @it_id: The posix timer id for identifying the timer |
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* @it_active: Marker that timer is active |
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* @it_overrun: The overrun counter for pending signals |
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* @it_overrun_last: The overrun at the time of the last delivered signal |
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* @it_requeue_pending: Indicator that timer waits for being requeued on |
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* signal delivery |
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* @it_sigev_notify: The notify word of sigevent struct for signal delivery |
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* @it_interval: The interval for periodic timers |
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* @it_signal: Pointer to the creators signal struct |
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* @it_pid: The pid of the process/task targeted by the signal |
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* @it_process: The task to wakeup on clock_nanosleep (CPU timers) |
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* @sigq: Pointer to preallocated sigqueue |
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* @it: Union representing the various posix timer type |
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* internals. |
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* @rcu: RCU head for freeing the timer. |
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*/ |
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struct k_itimer { |
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struct list_head list; |
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struct hlist_node t_hash; |
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spinlock_t it_lock; |
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const struct k_clock *kclock; |
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clockid_t it_clock; |
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timer_t it_id; |
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int it_active; |
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s64 it_overrun; |
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s64 it_overrun_last; |
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int it_requeue_pending; |
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int it_sigev_notify; |
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ktime_t it_interval; |
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struct signal_struct *it_signal; |
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union { |
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struct pid *it_pid; |
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struct task_struct *it_process; |
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}; |
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struct sigqueue *sigq; |
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union { |
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struct { |
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struct hrtimer timer; |
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} real; |
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struct cpu_timer cpu; |
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struct { |
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struct alarm alarmtimer; |
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} alarm; |
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} it; |
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struct rcu_head rcu; |
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}; |
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void run_posix_cpu_timers(void); |
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void posix_cpu_timers_exit(struct task_struct *task); |
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void posix_cpu_timers_exit_group(struct task_struct *task); |
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void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, |
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u64 *newval, u64 *oldval); |
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void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); |
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void posixtimer_rearm(struct kernel_siginfo *info); |
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#endif
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